Align T-REX 250 Plus DFC BTF-Futaba, Spektrum, JR, 3GX Brushless Motor Model Kit Includes: T-REX 250 PRO, 205D CF Blades, RCM-BL250MX(3600KV), 3GX MRS, DS425M Digital servo, DS415M Digital servo x 3, RCE-BL15P ESC, 37mm Tail Blade Requires: ALIGN T6 Futaba S-FHSS 2.4GHz Transmitter or JR/Spektrum 2.4GHz Transmitter (DSM2/DSMX), Pitch gauge , 11.1V 3S LiPo 850mAh battery Specifications: Length:431mm, Height:150mm, Main Blade Length:205mm, Main Rotor Diameter:460mm, Tail Rotor Diameter:100mm, Weight(With Motor):250g Specification 3GX MRS: Suitable Voltage Range: DC 3.5-8.4V, Current consumption:&lt;100mA @4.8V, RoHS certified, Size:37.6x22.4x13 mm, Weight: 10g Weight Users must have a certain concept of safety to operate RC helicopters